*For Discover it® and Discover® More® cardmembers only: Activate to earn 5% Cashback Bonus at Home Improvement Stores and Wholesale Clubs from 4/1/17 (or the date on which you activate 5%, whichever is later) through 6/30/17, on up to $1,500 in purchases. Home Improvement Stores are defined as home improvement retail stores, lumber/building material stores, paint/wallpaper stores, hardware stores and lawn and garden supply centers. Check with your Wholesale Club to make sure your Discover card is accepted. Certain Wholesale Club services, such as travel and cell phone purchases may not be eligible in this category. Purchases made using third-party payment accounts, tap-and-pay, mobile or wireless card readers, virtual wallets or similar technology may not be eligible. Rewards are added to your Cashback Bonus account within two billing periods. See Cashback Bonus Program Terms and Conditions for more information about your rewards.

Looks like Costco.com will accept Discover credit card. Purchashing costco gift cards should qualify right? So I should get 5% back from Discover and then another 2% back for Costco executive membership...

May be not. It depends on the category of the card swiping machine(here the fuel dispenser). at least in case of costco, the fuel dispensers are categorized as gas and fuels. So that won't count as wholesale club. But you get 5% back during quarter where they have cashback on fuel stations.

Sam's GC is interchangeable with Walmart, so this can effectively be 5% off at Walmart too if you're willing to deal with gift cards. You also get an additional $0.03 discount at Walmart Murphy gas pumps (at least in my area in Louisiana) if you use a Walmart/Sams GC.

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